http://www.irs.gov

• Joint Committee On Taxation
• The U.S. Tax Code Online
• Thomas Legislative Tracking Service
• Electronic Federal Tax Payment System (EFTPS)
• The Washington Post's Federal Internet Guide
• Nonprofit Gateway
• U.S. Senate
• The Department Of The Treasury Tax Policy Page
• Social Security Online
• U.S. Census Bureau
• U.S. Securities & Exchange Commission
• The White House